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Note 7 - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Current tax expense (benefit):
Federal	$ 3,799	$ 3,197	$ 2,707
State and local	219	243	239
	4,018	3,440	2,946
Deferred tax expense (benefit):
Federal	(839)	(83)	572
State and local	(462)	(154)	(108)
	(1,301)	(237)	464
Income tax provision	$ 2,717	$ 3,203	$ 3,410

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